KPNO 4 Meter Mayall - Basic Parameters and Facts
Updated on March 31, 2022, 5:51 am
This page describes the current 4 Meter configuration
- Design concepts for very wide field Prime Focus and Cassegrain configurations
- Additional facts relevant to possible use of the 4 Meter for large science programs
Longitude: 111:35:59.6 W, Latitude: 31:57:50.5 N, Altitude: 2123.2m MSL
Basic Optical Data
Prime Focus (f/3.1) Corrector and ADC Prisms
Opto-Mechanical Assembly - 4 Meter Prime Focus Corrector
The 4-m prime focus corrector is described in Jacoby, Liang, Vaughnn, Reed, and Armandroff (1988 SPIE, 3355, 721).
Calculated slew and servo settling time for the 4-meter telescope with the new Mayall Active Primary Support (MAPS) implementation. Slew motion occurs in both HA and DEC simultaneously, so the time estimate should use the longer of the two motions.
South East Annex Position
The position of the telescope when at the South East Annex is:
4MAPS - 4 Meter Active Primary System
4MAPS Manual (NOAO only)
Risley Prisms - Cass Focus
Cassegrain Cage Mechanical Data
* datum=back of primary mirror cell
There are some old (and old-fashioned paper) enormous drawings of the dome and environment, but they are like ancient papyrus and very crowded with information.
Mayall HA Operation Limits
Lower Shutter Up
Lower Shutter Down
* Note: The Airmass=2.1 limit was determined for Mosaic3. For DESI, with its 1.5 degree field, it's advised to point only to targets of airmass < 2.0 with the lower shutter raised.